High strength steel plate for big thickness tall building structure and production method thereof

The invention relates to a steel plate with high intensity and used in construction structures of high buildings with large thickness and a production method thereof. The steel plate of the invention consists of the following components according to weight percentage: less than or equal to 0.20 percent of C, less than or equal to 0.55 percent of Si, 1.00 to 1.70 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.70 percent of Ni, less than or equal to 0.70 percent of Cr, less than or equal to 0.20 percent of V, more than or equal to 0.015 percent of Nb, less than or equal to 0.20 percent of Ti, 0.020 to 0.060 percent of Al, and the rest is Fe and inevitable impurity. The produced Q460E-Z35 steel plate with a thicknessof 100 to 110 mm is capable of meeting the requirement of high intensity steel of large-thickness construction structure (Ceq is less than or equal to 0.50 percent); the steel plate of the invention can ...

Smelting method of high level detecting steel

The invention relates to a method for smelting high-grade flaw detection steel. The method comprises the steps of electric furnace melting, refining, vacuum treatment, casting and rolling, wherein under the condition of electric furnace melting, molten steel is subjected to preliminary deoxidation until the oxygen content is between 100 and 300 ppm, and the ladle temperature is controlled to be between 1,560 and 1,650 DEG C; under the condition of refining, an aluminum wire is fed according to the refining oxygen determination value, a grain refining agent is added into the molten steel, and argon blowing is performed for at least 3 minutes; the molten steel is refined until the oxygen content is between 20 and 30 ppm and the S content is not more than 0.015 percent, the temperature is controlled to be between 1,650 and 1,660 DEG C, and the molten steel is subjected to slag-off treatment; vacuum pre-molten slag is added into a ladle before vacuum treatment, and maintained for at least 20 ...

Electric furnace smelting method for low-carbon low-silicon steel

Electric furnace smelting method for low-carbon low-silicon steel

The invention relates to an electric furnace smelting method of low-carbon and low-silicon steel, which comprises the following steps: (1)melting with the electric furnace, plugging the hole of the electric furnace steel-tapping hole with magnesite (the dominant pool quantity of upper furnace is less than 10t, the ladle is normal red bright turnover ladle without oxidation sludge and reduction sludge, the temperature of the ladle is 1620Deg. C-1650Deg. C); (2)proceeding with VD/VOD vacuum decarburization for 12-15min; fixing the oxidization; intaking the aluminum wire quantity 200-400m according to the fixing oxidization value; adding electrolytic magnesium in order to adjust magnesium; (3)cleaning LF fining furnace ladle cover in the front of LF fining furnace and the fining seat ladle; throwing up the electrode lead in order to avoid increasing silicon and carbureting; controlling the deoxidization degree ( the steel liquid [o]=40-50ppm); guaranteeing the standard silicon content; desulfurizing ...

Electric furnace smelting method for high-grade pipe line steel

Large thickness quenched high strength steel and production method thereof

The invention belongs to the field of metal materials and discloses a large-thickness and high-strength quenched and tempered steel plate and a production method thereof. The steel plate mainly consists of the following chemical components by weight percentages: not more than 0.18% of C, 0.1-0.4% of Si, not more than 1.2% of Mn, 0.7-1.7% of Ni, 1.0-1.5% of Cr, 0.4-0.6% of Mo, 0.03-0.08% of V, 0.02-0.04% of Al, 0.0005-0.0020% of B, Fe and unavoidable impurities. The molten steel designed according to the components of the invention can be rolled into the large-thickness steel plate by smeltingprocess, casting process, heating process, rolling process, water cooling process and quenching and tempering process. The steel plate has the advantages of reasonable component design, good comprehensive properties and low production cost, can be applied to off-shore oil production platform engineering, power stations, engineering scaffolds and other industries and has good application prospect.

Electric furnace smelting method for high-grade pipe line steel

The invention relates to a electric furnace smelting method of the high-grade pipe line steel, which comprises the following steps: proportioning 60%-70% hot iron, 5%-10% iron, 15%-30% scrap steel and 5%-20% sponge iron; smelting the proportioned material in the electric stove( the smelting cycle is 45-55minutes); decarbonizing with the vacuum natural oxygen; proceeding with the reaction of the surplus oxygen content in the steel and the carton in the steel in the vacuum state after the electric stove discharges the steel; refining slag in the LF finer( the alkalinity of the refining slag is controlled at 2.5-3.5, the binary alkalinity is controlled at 5-7); deoxidizing with deoxidizer; controlling the argon gas flow at 300L/min; adding the electrolytic manganesium or the like in 20 minutes; completing 90% desulfuration in the good deoxidization condition when the temperature reaches about 1600Deg. C; adding the slight ferro-silicon powder and lime at the late refining when the argon gas ...

Large thickness quenched high strength steel and production method thereof

The invention belongs to the field of metal materials and discloses a large-thickness and high-strength quenched and tempered steel plate and a production method thereof. The steel plate mainly consists of the following chemical components by weight percentages: not more than 0.18% of C, 0.1-0.4% of Si, not more than 1.2% of Mn, 0.7-1.7% of Ni, 1.0-1.5% of Cr, 0.4-0.6% of Mo, 0.03-0.08% of V, 0.02-0.04% of Al, 0.0005-0.0020% of B, Fe and unavoidable impurities. The molten steel designed according to the components of the invention can be rolled into the large-thickness steel plate by smelting process, casting process, heating process, rolling process, water cooling process and quenching and tempering process. The steel plate has the advantages of reasonable component design, good comprehensive properties and low production cost, can be applied to off-shore oil production platform engineering, power stations, engineering scaffolds and other industries and has good application prospect.

High strength steel plate for big thickness tall building structure and production method thereof

The invention relates to a steel plate with high intensity and used in construction structures of high buildings with large thickness and a production method thereof. The steel plate of the invention consists of the following components according to weight percentage: less than or equal to 0.20 percent of C, less than or equal to 0.55 percent of Si, 1.00 to 1.70 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.70 percent of Ni, less than or equal to 0.70 percent of Cr, less than or equal to 0.20 percent of V, more than or equal to 0.015 percent of Nb, less than or equal to 0.20 percent of Ti, 0.020 to 0.060 percent of Al, and the rest is Fe and inevitable impurity. The produced Q460E-Z35 steel plate with a thickness of 100 to 110 mm is capable of meeting the requirement of high intensity steel of large-thickness construction structure (Ceq is less than or equal to 0.50 percent); the steel plate of the invention can ...